Spring-clip stirrup for reinforced concrete.



w. K. FELLOWS. SPRING CLIPSTIRRUP'FOR REINFORCED CONCRETE.

' APPLICATION FILED FEB. 21, 1908.

Patented Sept. '21, i909.

v onrrnn srA'rns PATENT OFFICE;

- WILLIAM K. rnL ows, or CHICAGO, ILLINOIS, ASBIGNORTO NIMMONS & FELLOWS, or

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s ecimen of Letters Patent.-

Illinois, have invented acertain new and "useful lipaproveifnent Spring-Clip Stir; rups for emforced aoncrete, of which the following is a specification.

' This invention relates to concrete constructionand theohjiect of the invention is to pro yids-1a device called for want of a better name, a stirrup; which may be, preferably by spring action, attached toa beam or other main supgortin "member of a building; a plurality. of sa d stirrups being'used upon said beamjor beams 'to'take up shearing stressesin the concrete beamor girder and to-;reinfor'c ing rods or bars within the concreteto be built around the said rods, and around the mam supporting beam or other supporting member.

The invention consists in a device capable of accomplishing these obj'e'cts which can be easily and cheaply made, and which can be very easilyappli-ed to the supporting member inthe building without it being necessary to use bolts, rivets, screws, wiring or other sirjlilardevic'eswhich are complicated and expensive to install.

- The inventionv also consists in the rein;

forced concrete member produced. by the use of, the supportingbeam, these stirrups and the reinforcing rods.

The invention also consists in features of construction which will behereafter more fully described-and claimed as the specification proceeds j The single drawing marked Figure 1 shows a perspective view of a girder or I 40 beam 2, embedded in concrete 27, indicated by the dotted lines of the figure" Upon this beam are mounted a plurality of the stirrups 01 this invention, each comprising in a single piece the portions 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15. F or convenience onlyone of the stirrups as for instance the front one in the figure will be described in detail the others being duplicates. In order to make each stirrup really a spring clip' stirrup which will of its own strength grasp the I beam between its portions7 andd'l, as shown, the portions 8 and 10 of the stirrup are made extending-upward some distance from the grasping jaws 7 and 11 of the stirrup, said upwardly extending portions being connected by a U shaped portion 9 11s shown, within which a supporting rod 17 may lie and be supported in the manner shown so as to itself support and hold absolutely in place the top reinforcement of the structure during the period of construction. In order Patented Sept. 21, 1909.

to securely lock each stirrup when sprung as shown, to a point adjacent to the 7 and 11, in which positionsaid collar securely locks the jaws upon the beam 2. As it is a particularly ilmportant function of the device to support reinljorcing rods the members i'ng rods 22' and 23 are respectively adapted to rest and be supported. From these seats or supportin points 5 and 13, the stirrup thenceexten s in-the members 4 and 14 to 3 and 15 respectively, upward and outward toward what is to be the top of the concrete upon the supporting bear'n 2, a collar or clip are made preferably to incline sharply away from the beam proper, ,as 7 shown, and have at ftheir bottoms saddles or seats 5 and 13 inwhich the'desired reinforcbeam 27,- to take up shearing the freinforced concrete beam or girder," Ii -practice these stirrups are used a at as frequent intervals along the beam 2 as it is found necessary to provide for said shearing stresses and these stirrups provide supports for the rods 17, 22 and 23-, so that said rods are very rigidly supported at their proper distance and heights with reference 'to' the beam 2,

so that when the concrete is .filled in around them in the manner shown a'st-r'ong' rein forced concrete constructiorris formed.

Over the rods 17, top reinforcing rods or similar devicesare. placed extending-in other directions than the direction of--the main beam 2 for the purpose of permanently reinforcing a floor, slab or. beam or Other part made of concrete which is-to be carried by the stri'i'cture describ d; As heretofore statedone ofthe important features of the device is to the concrete is being laid.

It will be noticed that this as' herei shown, resembles strongly a letterwhich the fjai'vs 7" and '11 "are placed aboptJ midway ofthe two middle mernbers, andm" holdtheseZrei-niorci-ng rods '25, or wire netting or the like finpl ace while which the reinforcing rodsarfe supported at p the angular. points of the W. Bythis conported in proper position at. oneside of thebeam and furthermore that all of this is accomplished by material necessary to provide for shearing stresses and without per-. forating or otherwise weakening the main beam in any way. ,Another important feature that the side rods 22 and 23, by their weight, serve to force the gripping jaws together and lock the stirrup upon the beam irrespective of whether the collar 20is used or not and of course where a plurality of stirrups are used along the beam as is always the case the rods look all the stirrups upon the beam, it being impossible to remove .one stirrup until the adjacent rods have been removed from all the other stirrups engaged by those particular. rods. Another important feature is that-the stirrups hold the reinforcing rods ,rigidly in predetermined positions so that they can not be moved out of said positions during construction as for instance while tamping the concrete. As

displaced rods are one of the frequent causes of collapse in concrete buildings this feature 4 of safety is of, vital importance. Another important feature is that while the beam supports the stirrupsand rods during construction it is necessary to also reinforce the beam so that the total load upon the buildingwill not after construction tear the beam 1 out of the concrete and this is taken pare of by the fact that the stirrups are rigidly secured to the beam with the result that the rods and stirrups ultimately reinforce the beam and provide for shear through the loiver halves of the jaws 7 and 11. Other methods of attaching reinforcing rods referred to herein require the employment of structural steel setters under union rules.

This device makes such expensive labor unnecessary and tluereby reduces the cost of the use of standard structural shapes for reinforcement in concrete buildings.

What T. claim as new and desire to secure by Letters Patent, is:

1. A hanger clip and spacing device for use in concrete floor construction consisting of a rod or strip of metal. provided with acentral body portion having means adapted to grip a beam and extensions above and below the gripping means provided with seats adapted to support the reinforcing bars of the floor structure clear ,off and at a distance from the beam to which it is-deSignedto be attached.

2. A hanger clip and spacing device for use in reinforced concretefloor structures consisting of a rod or strip of metal provided with a central body portion having means adapted to grip a beam, extensions above and below the gripping means pro vided with seats adapted to support the reinforcing bars'of the floor structure, clear off and at a. distance, from the beam to which it is designed to be attached and shear members extending upwardly from the lower supporting seats substantially as described.

3. A hanger clip and a spacing device for use in concrete floor construction consisting of a rod or strip of metal provided with a central body portion havin means adapted to grip the flange of an 'I- earn and extensions above and below the gripping means provided with seats adapted to support the reinforcing bars of the floor structure.

4. A'hanger clip and spacing device for use in reinforced concrete floor structures consisting of a'rod or strip of metal provided with a central bodyortion having means adapted to grip the g beam, extensions above and below the gripange of an I- ping means provided with seats adapted tosupport the reinforcing bars of. the floor structure, and shear members extending up w'ardly from' the lower supporting seats substantially as described.

5. A concrete construction comprising a supporting member, a plurality of stirrups detachably secured along said members saidstirrups each being integral structures providing' a support for a supporting rod above the top of the beam and supports for reinforcing rods on opposite sides of the supporting member and parallel to its lower portion, supporting and" reinforcing rods upon said stirrups and ncrete surroundng the whole as and for the purposes set forth.

(3. A stirrup of the class described, made in the general form of a letter W, the two middle members being provided with gripping means for securing the device to a supporting member.

7. A stirrup of the class de cribed, made in the general form of a letter? W, the two middle members being provided with gripping means for securing the device to a supporting member, and means engaging the upper central por'tionfor securing the stirrup in position.

8. A stirrup of the class described, made in the general formof a letter W, the two interior members being provided with gripping means for securing the device to a supporting member and there beingformed at the angular points of the stirrup seats for reinforcing rods running at right angles to the plane of the stirrup, and means engaging'the upper central portion for securing the stirrup in position.

9. A stump, for usein' concrete construetion consisting of a rod or strip of metal bent so 'a's to'provide a cent'ral body portion having means adapted to grip a beam, an

exten ion above the gripping means providmg a seat for a remforcing rod and a supplemental device slidable upon the parts of 1(. the stirrup eboYe' the gripping mechanism aolapted to clamp the stirrup in position WILLIAM K. FELLOWS.

Witnesses DWIGHT B. CHEEVER, C. J. GHRIS'IOFFEL. 

